<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		
	</body>
	<script>
			function fn(){
				var d1 = + new Date();
				var array = [];
				for(var i=0 ; i<100 ; i++){
					array.push('<div style="width:100px;height:2px;border:1px solid black;"></div>');
					
				}
				document.body.innerHTML = array.join(',');
				var d2 = + new Date();
				console.log(d2 - d1);
			}
			fn();
		</script>
</html>
